Aptamer/derivatization-based surface-enhanced Raman scattering membrane assembly for selective analysis of melamine and formaldehyde in migration of melamine kitchenware
Abstract null null The analysis of contaminants in migration of food contact material (FCMs) is an urgent demand for food safety. In this study, melamine and formaldehyde in melamine kitchenware were selectively analyzed by surface-enhanced Raman scattering (SERS) via aptamer/derivatization-based membrane assembly. The membrane assembly was designed by simple filtration of Ag nanoparticles-decorated “stellate” silicon dioxide (SiO2/Ag) and composites of reduced graphene oxide and Ag nanoparticles (rGO/Ag) functioned with specific reagents. High selectivity can be realized by melamine aptamer and derivatization reagent of formaldehyde, respectively. The relative standard deviations (RSDs) of melamine and formaldehyde analysis for 11 replicate measurements, 14 consecutive days and 25 batches are less than 6.0 %, which shows excellent repeatability and reproducibility. After the method was validated, the limits of detection (LOD) for melamine and formaldehyde are 0.15 mg/L and 0.21 mg/L, respectively. The developed method was applied to determine the content of melamine and formaldehyde in migration of melamine kitchenware with low relative errors (less than 5.3 %) compared to chromatographic results. The recoveries of melamine and formaldehyde for migrations of melamine kitchenware are 91.2–110.0 % and 94.0–106.0 % with RSDs in range of 1.8–8.3 % and 4.7–9.1 %, respectively. The method proposed a new concept of convenient, portable and reliable strategy for analysis of melamine and formaldehyde in migration from FCMs.
Last. Lizhou Yue(Xida: Guangxi University)H-Index: 1
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Abstract Illegal addition of melamine (MEL) to milk has caused serious food safety accident. It is urgent to develop a highly sensitive method for detecting MEL in milk. β-Cyclodextrins with inner hydrophobic and outer hydrophilic cavities have been widely used in smart sensors design. In this study, an “ON-OFF-ON” sensor for MEL detection was constructed based on β-Cyclodextrins modified carbon nanoparticles (β-CD-CNPs). The sensor is switched “OFF” when Fe3+ interacts with β-CD-CNPs and switch...
#1Xiaoyan Ouyang(SYSU: Sun Yat-sen University)H-Index: 1
#2Zicheng Lu(SYSU: Sun Yat-sen University)H-Index: 2
Last. Gongke Li(SYSU: Sun Yat-sen University)H-Index: 57
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Excessive absorbtion of migrating substances from food contact materials can affect human health. Thus it is essential to analyze the migration of contaminant from food contact materials. However, comprehensive analysis has been challenged by low concentration of migrating substances, manifold and complex matrix interference of food contact materials. Therefore, appropriate sample pretreatment methods should be applied before instrumental detection, which is essential to improve the analytical e...
#1Courtney A. Cruse(IUPUI: Indiana University – Purdue University Indianapolis)H-Index: 2
#2John V. Goodpaster(IUPUI: Indiana University – Purdue University Indianapolis)H-Index: 15
Abstract Gas chromatography/vacuum UV spectroscopy (GC/VUV) was utilized to study various explosives and pharmaceuticals in the nitrate ester and nitramine structural classes. In addition to generating specific VUV spectra for each compound, VUV was used to indicate the onset of thermal decomposition based upon the appearance of break-down products such as nitric oxide, carbon monoxide, formaldehyde, water, and molecular oxygen. The effect of temperature on decomposition could be fit to a logist...
Abstract The potential of surface-enhanced Raman scattering (SERS) has been investigated for the rapid analysis of two representative organotin compounds (OTCs): dibutyltin maleate (DTM) and tributyltin chloride (TBT), after migration tests from polyvinyl chloride (PVC), as a model food packaging material in aqueous food simulant (acetic acid 3% w/v). OTCs, often used as heat stabilizers additives for PVC, are classified as endocrine disrupting chemicals (EDCs) and their migration potential has ...
#1Limin Li(NUS: National University of Singapore)H-Index: 1
#2Wee Shong Chin(NUS: National University of Singapore)H-Index: 26
Flexible and transparent SERS substrates have long been sought-after for non-destructive detection of analytes on non-planar surfaces, but there is still a lack of one convenient and robust way to fabricate such SERS substrates rapidly. Herein, we demonstrate the fabrication of high performance SERS substrate consisting of plasmonic Ag nanocubes (Ag NCs) arrays anchored onto flexible transparent polydimethylsiloxane (PDMS) membrane. Through simple organic/water interfacial self-assembly method, ...
Last. Gongke Li(SYSU: Sun Yat-sen University)H-Index: 57
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In this work, a rapid and sensitive thin-layer chromatography combined with surface-enhanced Raman spectroscopymethod was established for rapid detection of benzidine and 4-aminobiphenylin migration from food contactmaterialsbased on Au nanoparticle doped metal-organic framework. Benzidineand4-aminobiphenylwere firstly separated by thin-layer chromatographyto solve the limitation of their overlapping Raman peaks. Then the target molecules were monitored by adding AuNPs/MIL-101(Cr) on the sample ...
Last. Xi Chen(Ha Tai: Xiamen University)H-Index: 70
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The reaction of formaldehyde (HCHO) with the solution containing Au nanoparticles and [Ag(NH3)2]+ through Tollens' reaction is described to form Au@Ag nanoparticles (Au@AgNPs), which are used as a SERS enhancement material. A minimized hydrodistillation device with air condense is designed to obtain a clean aqueous background for SERS analysis and simplified pretreatment process. A good linear relationship is found between the SERS signals and the concentration of HCHO in the range 0.3 to 55 mg ...
Last. Jun-Wu Zhao(Xi'an Jiaotong University)H-Index: 20
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Abstract In this study, we developed a simple and sensitive surface-enhanced Raman scattering (SERS) technique for the detection of choline in infant formulas based on a filter-based flexible substrate. The flexible substrate with excellent SERS activity and reproducibility was fabricated using a syringe filter and Ag triangular nanoplates. The Raman marker, 3-mercaptophenylboronic acid, was oxidised to 3-hydroxythiophenol in the presence of H2O2, which caused a decrease in the SERS peak intensi...
Last. Gongke Li(SYSU: Sun Yat-sen University)H-Index: 57
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Abstract In this work, we introduced an aptamer modified Au nanoparticles doped covalent organic frameworks composite (IBAs-AuNPs/COF) to improve the property of selective enrichment of insulin from serum samples. The Au nanoparticles were immobilized on imine-based COF by in-situ reduction reaction via mussel inspired polydopamine coating, and then sulfhydryl-containing aptamers were bonded to the surface of AuNPs through an Au-S linkage. Due to the excellent adsorption property of COF and spec...
#1Xue Sheng(SCNU: South China Normal University)H-Index: 3
#2Xiao-Fang Jiang(SCNU: South China Normal University)H-Index: 35
Last. Xiaobo Xing(SCNU: South China Normal University)H-Index: 10
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For the first time, a reproducible surface-plasmon-enhanced optical sensor for the detection of gaseous formaldehyde was proposed by depositing the mixture of CdSe@ZnS quantum dots (QDs), fumed silica (FS) and gold nanoparticles (GNs) on the surface of silica spheres array to meet the urgent requirement of a rapid, sensitive, and highly convenient formaldehyde detection method. Due to the spectra overlap between QDs and GNs, plasmon-enhanced fluorescence was observed in the film of QDs/FS/GNs. W...
